What Do Headaches, Gas And Bloating When On Nexplanon Suggest?

i got the Nexplanon October 29th and the 29th of this month will make 6 months since i ve had it. i ve had normal periods and wasn t noticing any side affects...well about 5 days ago (on satruday) me and my boyfriend had unprotected sex and after Saturday i started experiencing pregnancy symptoms like having to pee constantly,backpain,headache,constantly tired,gas and bloating... My question is would it be a possiblilty i could be pregnant while having the Nexplanon